5 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 65791 | Thayer | 4,234 |
| 65606 | Alton | 2,431 |
| 65692 | Koshkonong | 983 |
| 65778 | Myrtle | 485 |
| 65690 | Couch | 131 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 5 ZCTAs in Oregon County, Missouri (US Census).